Tenable Nessus is a world-leader in active vulnerability scanners. It features high-speed discovery, configuration auditing, asset profiling, sensitive data discovery, and vulnerability analysis of your security posture. Nessus scanners may be distributed throughout an entire enterprise, inside DMZs, and across physically separate networks. It is free of charge for personal use in a non-enterprise environment.

Monkey HTTP Daemon is a very fast and lightweight Web server for Linux. It uses a hybrid networking model based on asynchronous calls (event-driven) and fixed threads, which makes it scalable and capable of attending thousands of clients per second. It provides a powerful API for C and is ideal for embedded devices, thanks to its small core and plugin architecture.

Seafile is a file synchronization and collaboration platform. It comes with Dropbox-like file syncing, but is designed to be better suited to teamwork. You can build a file syncing and collaboration service for your team on your servers. It can also be used to build your own Dropbox for personal use.

EDB (Evan's Debugger) is a Qt4 based binary mode
debugger with the goal of having usability on par
with OllyDbg. It uses a plugin architecture, so
adding new features can be done with ease. The
current release is for Linux, but future releases
will target more platforms.

UCS is a reliable, pre-configured Linux server operating system featuring: Active Directory-like domain services compatible with Microsoft Active Directory; a mature and easy-to-use Web-based management system for user, rights, and infrastructure management; a scalable underlying concept suited for single server scenarios as well as to run and manage thousands of clients and servers for thousands of users within one single UCS domain; an app center providing single-click installation and integration of many business applications from 3rd parties and Univention; management capabilities to manage Linux- and UNIX-based clients; and command line, scripting interfaces, and APIs for automatization and extension. Its purpose is to provide Microsoft Server-like services on the cloud or on the premises, to run and operate corporate IT environments with Windows- and Linux-based clients, and to extend those environments with proven enterprise software.

Bastille Unix (formerly Bastille Linux) aims to be the most comprehensive, flexible, and educational Security Hardening Program for Red Hat (Fedora Core, Enterprise Linux, and original Red Hat), SuSE, Gentoo,
Mandrake, and Debian Linux, as well as HP-UX and
Mac OS X. Virtually every task it performs is optional, providing immense flexibility. It educates the installing admin regarding the topic at hand before asking any question. The interactive nature allows the program to be more thorough when securing, while the educational
component produces an admin who is less likely to
compromise the increased security.

OpenProtect is an anti-spam server that filters spam and blocks viruses, phishing, and other malware. Acts as an SMTP gateway and integrates with any email server like Postfix, Sendmail, qmail, Exim, Microsoft Exchange, Lotus Domino, Zimbra, etc.

Oolite is an independent reinterpretation and ehancement of the classic space sim game Elite for modern computers. The result is a space trading and combat simulation offering encounters with pirates, police, bounty hunters, the occasional alien menace, and other surprises along the way. While striving to reach the coveted Elite status, the players set their own path through the various galaxies, choosing to be trader, pirate, or bounty hunter depending on the situation at hand, and their own judgement. The game is hugely expandable, using a combination of property lists and JavaScript. Oolite's active modding community already provides more than 200 OXPs (Oolite eXpansion Packs). Among them are a huge variety of missions, weapons, ships, and extra career paths over and above what's available within the core game, as well as a number of other gameplay enhancements and customizations.